Colored polycarbonate articles with high impact resistance
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United States of America Patent
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Mar 14, 1989
Grant Date -
N/A
app pub date -
Dec 1, 1987
filing date -
Dec 1, 1987
priority date (Note) -
Expired
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Abstract
Polycarbonate articles, especially eyeglass and optical lenses, are dyed in a dye solvent having a boiling point of at least 350.degree. F. in which a dye is dissolved. The article to be dyed is retained in the solution maintained at 200.degree. F. or more until sufficient dye has penetrated the polycarbonate, then removed, rinsed and dried. The dyeing operation does not unduly detract from impact resistance and the dyed product exhibits excellent ultraviolet light stability.
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